1 results about "S system" patented technology

This invention proposes a method for clock calibration of an SPI device, comprising the following steps: Step 1: When the master device in the SPI device performs a write operation, the master device pulls the CSN signal low and provides 48 consecutive SCK clock signals; after the slave device detects that the CSN signal is low, it starts counting from the rising edge of the first SCK clock signal, and the counter starts counting from 0; the counting frequency is the high-frequency clock f inside the slave device. HSI When the slave device detects the 48th SCK clock signal, the counter stops counting and stores the count value CNT in the slave device's register; Step 2: The master device reads the count value CNT held in the slave device's counter register; Step 3: Calculate the slave device's system clock f based on the count value. HSI Step 4: The master device writes the correction compensation value, i.e., the correction frequency mentioned in step 3, into the corresponding address of the slave device's register to complete the clock correction.